Video Streaming and HTTP error 458

I recently encountered HTTP error 458.

It was when one of Zoom Player STREAM's users was unable to play any stream while saying that his other player was streaming from the same source with no issues.

To verify the issue was not related to a firewall or networking issue local to the user's PC, I tried opening the URL in a browser and it returned an HTTP Error 458.

I searched online and found various references to HTTP Error 458 being related to custom user-agents and other custom setup requirements. Unfortunately, this was unrelated to the actual issue at hand.

The solution?

It turned out the user was playing a stream in another player while setting up Zoom Player without realizing that the subscription from his service provider is limited to concurrently streaming only 1 stream.

How many streams?

Do you know how many concurrent streams are available with your subscription?

When authenticating a subscription in Zoom Player's advanced options dialog (under Playback / Video Streaming), you can see the exact number of concurrently playing streams your provider includes with your account :

You can always revisit this information by clicking the edit button with your subscription highlighted and then clicking the "Authenticate subscription" button.

P.S.
When failing for this cause, Zoom Player does not show error 458. You have to copy the failed URL from the error dialog and paste it in a browser.